Name two common antacids.

34 What do you think will be the pH of an antacid solution: less than 7 or more than 7? 34 How does an antacid work? 35 Separate the following into substances having pH values above and below 7. How do these influence litmus paper?

(i) Lemon juice

(ii) Solution of washing soda

(iii) Toothpaste

(iv) Vinegar

(v) Stomach juices

36 Do basic solutions also have H⁺ (aq) ions? If yes, then why are they basic?